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- W2028227005 abstract "Abstract A Raman microprobe spectroscopy characterization of microscopic fracture mechanisms is presented for a natural hydroxyapatite material (cortical bovine femur) and two synthetic hydroxyapatite‐based materials with biomimetic structures—a hydroxyapatite skeleton interpenetrated with a metallic (silver) or a polymeric (nylon‐6) phase. In both the natural and synthetic materials, a conspicuous amount of toughening arose from a microscopic crack‐bridging mechanism operated by elasto‐plastic stretching of unbroken second‐phase ligaments along the crack wake. This mechanism led to a rising R ‐curve behavior. An additional micromechanism, responsible for stress relaxation at the crack tip, was recognized in the natural bone material and was partly mimicked in the hydroxyapatite/silver composite. This crack‐tip mechanism conspicuously enhanced the cortical bone material resistance to fracture initiation. A piezo‐spectroscopic technique, based on a microprobe measurement of 980 cm −1 Raman line of hydroxyapatite, enabled us to quantitatively assess in situ the microscopic stress fields developed during fracture both at the crack tip and along the crack wake. Using the Raman piezo‐spectroscopy technique, toughening mechanisms were assessed quantitatively and rationally related to the macroscopic fracture characteristics of hydroxyapatite‐based materials. © 2003 Wiley Periodicals, Inc. J Biomed Mater Res 65A: 229–236, 2003" @default.
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- W2028227005 date "2003-03-12" @default.
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- W2028227005 title "Study of the toughening mechanisms in bone and biomimetic hydroxyapatite materials using Raman microprobe spectroscopy" @default.
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- W2028227005 doi "https://doi.org/10.1002/jbm.a.10447" @default.
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